Additional genes inhibiting winter habit in wheat

Summary Earlier studies of the genetics of winter-spring habit in wheat, in conjunction with the present studies, have led to the determination of the genotypes of eleven spring cultivars. Four spring cultivars each possessed two inhibitors which are the subject of further study. One notable cultivar - WW15, known to have a very high yield potential - possesses the single inhibitor Vrn₁, making it only one step removed from the winter wheats.Evidence is presented for the existence of at least one additional inhibitor, the identity of which is currently under investigation.